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如何打开蓝牙连接并成为A2DP源和接收器

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我想使用Python连接到蓝牙设备并将其用作扬声器 . 例如，使用Python播放.wav并在设备上听到并验证它正在播放等 . 我想在我的linux盒子上播放音频并在蓝牙设备上收听它 .

我正在做一些看看stackoverflow，似乎我可以使用pybluez连接，但然后需要使用dbus来设置实际的音频连接 . 我找到Linux BlueZ dbus communication a2dp，但结果是：

dbus.exceptions.DBusException: org.freedesktop.DBus.Error.UnknownMethod: Method "DefaultAdapter" with signature "" on interface "org.bluez.Manager" doesn't exist

当它试图从界面上获取默认适配器时，我甚至没有得到原始海报问题 . 感谢您的任何帮助！这是代码：

import dbus as dbus
bus = dbus.SystemBus()

man = bus.get_object('org.bluez', '/')
iface = dbus.Interface(man, 'org.bluez.Manager')
adapterPath = iface.DefaultAdapter()
adapter = dbus.Interface(bus.get_object('org.bluez', adapterPath),dbus_interface='org.bluez.Adapter')
devices = adapter.GetProperties()['Devices']

for d in devices:
    dev = dbus.Interface(bus.get_object('org.bluez', d),dbus_interface='org.bluez.Device')
    props = dev.GetProperties()
    if any(AudioSourceServiceClass_UUID in UUID.upper() for UUID in props["UUIDs"]):
        devobj = bus.get_object('org.bluez', d)
        devobj.Trusted = True
        if props["Connected"] == True:
            print  props["Name"] + " is connected!"
            exit()

for d in devices:
    dev = dbus.Interface(bus.get_object('org.bluez', d),dbus_interface='org.bluez.Device')
    props = dev.GetProperties()
    if any(AudioSourceServiceClass_UUID in UUID.upper() for UUID in props["UUIDs"]):
        #This device is an A2DP Audio source
        print  props["Name"] + " has A2DP audio source"
        #dev.connect_to_signal("PropertyChanged", handler_for_device(dev))
        #dev.connect_to_signal("PropertyChanged", cb)
        devobj = bus.get_object('org.bluez', d)
        try:
            devobj.Connect(dbus_interface='org.bluez.AudioSource')
            devobj.Play()
            exit()
        except dbus.DBusException, e:
            print str(e)

我有两个问题 .

  • 如何成为A2DP来源？

  • 如何修复获取适配器路径时抛出的异常？

python linux audio bluetooth a2dp

1 回答

  • 1

    此代码不起作用的原因是bluez 5.0不再支持org.bluez.Manager类

    这里含糊不清地描述：http://www.bluez.org/bluez-5-api-introduction-and-porting-guide/

    bluez源代码中有一些示例，即：test / list-devices：https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/test/list-devices

    这是该代码的python3版本：

    from __future__ import absolute_import, print_function, unicode_literals

import dbus

bus = dbus.SystemBus()

manager = dbus.Interface(bus.get_object("org.bluez", "/"),
                    "org.freedesktop.DBus.ObjectManager")

def extract_objects(object_list):
    list = ""
    for object in object_list:
        val = str(object)
        list = list + val[val.rfind("/") + 1:] + " "
    return list

def extract_uuids(uuid_list):
    list = ""
    for uuid in uuid_list:
        if (uuid.endswith("-0000-1000-8000-00805f9b34fb")):
            if (uuid.startswith("0000")):
                val = "0x" + uuid[4:8]
            else:
                val = "0x" + uuid[0:8]
        else:
            val = str(uuid)
        list = list + val + " "
    return list

objects = manager.GetManagedObjects()


all_devices = (str(path) for path, interfaces in objects.items() if
                    "org.bluez.Device1" in interfaces.keys())

for path, interfaces in objects.items():
    if "org.bluez.Adapter1" not in interfaces.keys():
        continue

    print("[ " + path + " ]")

    properties = interfaces["org.bluez.Adapter1"]
    for key in properties.keys():
        value = properties[key]
        if (key == "UUIDs"):
            list = extract_uuids(value)
            print("    %s = %s" % (key, list))
        else:
            print("    %s = %s" % (key, value))

    device_list = [d for d in all_devices if d.startswith(path + "/")]

    for dev_path in device_list:
        print("    [ " + dev_path + " ]")

        dev = objects[dev_path]
        properties = dev["org.bluez.Device1"]

        for key in properties.keys():
            value = properties[key]
            if (key == "UUIDs"):
                list = extract_uuids(value)
                print("        %s = %s" % (key, list))
            elif (key == "Class"):
                print("        %s = 0x%06x" % (key, value))
            elif (key == "Vendor"):
                print("        %s = 0x%04x" % (key, value))
            elif (key == "Product"):
                print("        %s = 0x%04x" % (key, value))
            elif (key == "Version"):
                print("        %s = 0x%04x" % (key, value))
            else:
                print("        %s = %s" % (key, value))

    print("")
    回复于

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